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Technical Information (MGB 13B) Last Modified - 9/20/04
British Automotive has introduced a redesigned rear upper shock absorber mounting bracket kit. This kit is suitable for Koni, Spax, Monroe and British Automotive's KYB telescopic shock absorbers.
This
newly design upper mounting bracket kit is available under part number
S/ABS.BRKT. The brackets are left and right handed, and are now incorporated
within the complete shock absorber kits S/ABS.KIT and S/ABS.MKIT.
This
new design features the following:
1.
A
new upper shock absorber mounting pin position with a maximum offset of
3.1/4" upwards which, depending upon your vehicle's rear suspension ride
height, may not require the change over of the OEM shock absorber lower link
mounting plates from side to side.
2. Multi mounting holes that allows for simple
installed height adjustment increments
of approximately 1".
3.
Allows
for a more efficient shock absorber working angle. Various shock absorber
kits that are available have shock
absorber angles of between 20 and 25 degrees, this
new upper bracket, depending on the
mounting holes used, will reduce this to
between 5 and 8 degrees.
LEFT HAND BRACKET
P0002644
When
establishing your ideal shock absorber installed height, it may be necessary to
install a 1/2" spacer block between the lower spring seating pad and the
lower shock absorber mounting bracket. To this end, we strongly recommend the
installation of nylatron spring seating pads. These seating pads should always
be liberally coated with lubricant upon assembly
Since, the working angle of the shock
absorber will vary with it's installed height, the installer should be aware of
any shock absorber body interference with the rigid brake lines that run along
the axle tubing. If there is any interference, simply bend the offending brake
line to clear the shock absorber body.
The
following image shows the British Automotive KYB kit applicable to the MGB
& MGA models.
NOTE:
This kit utilizes your OEM lower shock absorber link-mounting bracket in the
existing position.
PART NUMBER S/ABS.KIT
P0002669
The above shock absorber kit contains the following:
2.
KYB
gas charged shock absorbers
2.
Redesigned
upper mounting brackets
2
Nylatron
spring seating pads (upper)
2.
Nylatron
spring seating pads (lower). Fitted with Delrin "O" ring locators.
2.
Teflon
lube
2
1/2"
Lower spacer blocks.
4 1/2" SAE nyloc nuts
2
1/2"
x 2.5" SAE bolts.
10 1/2 SAE flat washer
8 7/16" SAE flat washer
4 7/16" SAE lockwasher
4 7/16" SAE nut
8
3/8"
SAE nyloc nuts
INSTALLATION INSTRUCTIONS
NOTE:
In the past, we have provided instructions requiring that the vehicle jack
stands be placed, depending upon which operation is being carried out, either
under the body, or either under the rear axle tubing. We have reviewed these
prior instructions, and concluded that it is more convenient to have the
vehicle on car ramps, or a hoist, with the wheels making contact in such a way
that the full vehicle weight is exerted over the road wheels.
Remove
the shock absorber links from the lower plates.
Remove
shock absorbers complete with links.
Using
the lower of the 4 mounting holes, install new upper mounting bracket. There is
no need to install the lockwashers at this stage, simply hand tighten nuts.
(1)….
Measure the distance between the rear axle bump stop pedestals and the
progressive bump stop rubbers. This
distance represents the amount of suspension travel available under
"bump" conditions. Remember that the rear ride height has a direct
relationship with this measurement.
(2)….
Measure the distance from the upper bracket shock absorber mounting stud to the
center of the OEM shock absorber link mounting plate hole.
Using
British Automotive's specifically manufactured KYB gas charged shock absorber
units; we now refer you to the following:
PART
(VBPBA1) DIMENSIONS
Compressed
Length 10.0"
Extended
Length 16.0"
Working
Length 6.0"
Installed
Height *13.5"
Ideal
"Bump" Travel 3.0"
Ideal
"Rebound" Travel 3.0"
*
Since the shock absorbers contain no internal bump stop, we have allowed
1/2" compression of the bump stop to prevent damage from "bottoming
out". Continuing…
Observing the Working Length dimensions
above, we would, ideally, like to have an equal amount of "bump" and
"rebound" shock absorber travel. However, this is not entirely
possible. As indicated previously, our main efforts should be in providing
sufficient shock absorber travel so that the unit does not "bottom
out".
Using
the Ideal "Bump" Travel dimension
above, compare this to the measurement taken in (1) previously. Is this measurement more than 3.0", or
less than 3.0"? The dilemma facing
us is what amount of "bump" travel is acceptable if this measurement
is less than 3". I consider 2.1/2" to be the minimum. If you have
appreciably less than this you should consider raising the rear ride. We
recommend the installation of British Automotive's variable ride height front
spring eye bracket and adjustable rear shackle assembly.
Please
note that the front spring eye bracket is also used for the installation of
British Automotive's traction control kit (composite springs only). When used
in conjunction with this device, the bracket is redundant for increasing the
rear ride height.
Installing
new OEM steel leaf springs as an alternate would require the owner to use the
original OEM lever type shock absorber. This is due to the horrendous arch that
is prevalent with new steel springs, which produce excessive rear ride heights.
In this circumstance, before upgrading to telescopic shock absorbers, it would
be better to let the springs settle over a period of time.
Working
with the Extended Length dimensions
above, compare this to the recorded measurement you have just taken. If this
measurement is greater than the Extended
Length dimension above, the shock absorber would in actual fact limit the
amount of rear axle droop, and not the axle check strap.
Next,
measure the distance between the bump stop pedestal and the progressive bump
stop rubber. This measurement now represents the amount of suspension travel
the rear axle goes through before actual bump stop contact is made. The above
shock absorber Working Length dimension must fall within this measurement.
PART NUMBER S/ABS.MKIT
P0002679
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